*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --white: #fff;
  --light-grey: #e1e0e0;
  --dark-purple: #7c0e7c;
  --black: #000;
}

body {
  background-color: var(--light-grey);
}

.navbar {
  background-color: var(--white);
}

.navbar ul {
  display: flex;
  justify-content: space-around;
}

.navbar ul li {
  list-style: none;
  border-radius: 4px;
}

.navbar ul li a {
  text-decoration: none;
  color: var(--black);
  padding: 10px;
  display: inline-block;
  width: 100%;
}

button {
  background: transparent;
  border: none;
  font-family: 'Times New Roman', Times, serif;
  padding: 10px;
  font-size: 1rem;
}

.navbar ul .nav-item a:hover {
  background-color: var(--dark-purple);
  color: var(--white);
}

button:hover {
  background-color: var(--dark-purple);
  color: var(--white);
}

.navbar ul .nav-item .sub-menu {
  visibility: hidden;
  opacity: 0;
  position: absolute;
  right: 5%;
  transition: opacity 0.5s ease;
  display: block;
  background-color: var(--white);
}

@media (min-width: 768px) {
  .navbar ul .nav-item .sub-menu {
    right: 15%;
  }
}

@media (min-width: 1024px) {
  .navbar ul .nav-item .sub-menu {
    right: 13%;
  }
}

.navbar ul .nav-item:hover .sub-menu,
.navbar ul .nav-item:focus-within .sub-menu {
  visibility: visible;
  opacity: 1;
}